Siemens Sinamics G110M Original Instructions Manual page 194

Functions
8.6 Motor control
Function
From the actual speed, the actual motor torque and the frictional torque of the load, the
inverter calculates the total moment of inertia of the load and motor.
Figure 8-24
Calculating the load torque
194
Overview of the function of the moment of inertia estimator
At low speeds, the inverter calculates the load torque
M from the actual motor torque.
L
The calculation takes place under the following con-
ditions:
• Speed ≥ p1226
• Acceleration setpoint < 8 1/s
480 rpm per s)
• Acceleration × moment of inertia (r1493) < 0.9 ×
p1560
SINAMICS G110M Operating Instructions
Operating Instructions, 04/2015, FW V4.7.3, A5E31298649B AD
(≙ speed change
2